Professional paper
https://doi.org/10.17794/rgn.2021.4.8
TECTONIC GEOMORPHOLOGY OF THE KARANGSAMBUNG AREA, CENTRAL JAVA, INDONESIA
Edi Hidayat
orcid.org/0000-0003-0265-7420
; Faculty of Geological Engineering, Universitas Padjadjaran, Jatinangor, Sumedang 45363, Indonesia; Research Center for Geotechnology, Indonesian Institute of Sciences, Jln. Sangkuriang, Bandung 40135, Indonesia
Dicky Muslim
; Faculty of Geological Engineering, Universitas Padjadjaran, Jatinangor, Sumedang 45363, Indonesia
Zufialdi Zakaria
; Faculty of Geological Engineering, Universitas Padjadjaran, Jatinangor, Sumedang 45363, Indonesia
Haryadi Permana
; Research Center for Geotechnology, Indonesian Institute of Sciences, Jln. Sangkuriang, Bandung 40135
Dimas Aryo Wibowo
orcid.org/0000-0002-2136-9400
; Research Center for Geotechnology, Indonesian Institute of Sciences, Jln. Sangkuriang, Bandung 40135
Abstract
Karangsambung, located in Central Java, Indonesia has complex geological conditions of the tectonic evolution of Java Island due to the subduction process of the India-Australia plate with the Eurasian plate in the Cretaceous-Paleocene. The tectonic movements in the subduction zone have resulted in diverse geological structures and rock types and impact the morphological shape of the study area. The level of tectonic activity in the study area can be determined using a tectonic geomorphological approach. A digital elevation model and geographic information systems are used for geomorphic data processing. Geological data observations were also carried out in the form of river terraces. Seven geomorphic index parameters have been calculated to determine the youngest tectonic activity through the relative tectonic activity index (IAT) of the study area: the ratio of the valley floor width to the valley height, the drainage basin asymmetry, the river gradient-length index, the basin shape index, mountain front sinuosity, drainage density, and the hypsometric integral/hypsometric curve. The IAT score is divided into four classes which are class 1 (0%) very highly, class 2 (13%) highly, class 3 (56%) moderately, and class 4 (31%) low. The IAT shows that the research area is categorized as an active tectonic area so that the morphology formed is more influenced by tectonic activity than erosion. Geological data analysis on uplifted and deformed river terrace outcrops shows that the study area is affected by neotectonic activity.
Keywords
geomorphic index; relative tectonic activity; neotectonic; Karangsambung
Hrčak ID:
262706
URI
Publication date:
21.9.2021.
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